Made by High Tech Pet, manufacturer of your Power Pet brand automatic pet door Provides the precise signal signal to reliabily open your door Exceeds quality and performance of knock-off brands at a very competitive price Battery included (unlike knock-off brands). Typical 3 - 4 month battery life. Water resistant and submersible Adjustable nylon strap fits most cats and dogs Knock Off products have known reliability issues. Don't trust your pet to anything less that a genuine High Tech Pet brand collar Genuine High Tech Pet collar 3 Pack from the USA manufacturer of the Power Pet door. This bundle is a high quality, value priced alternative to pooly made knock-off collars. Unlike the copies, this model emits the precise digital signal developed by High Tech Pet that your Power Pet door requires for reliable operation. These collars will out perform and outlast the knock-offs. Battery included (unlike copied products). One size fits all. Backed by our US based expert customer service team.